Effect of Annealing Temperatures on Luminescence Properties in Ce3+-Yb3+ Codoped Oxyfluoride Glass-Ceramics for Solar Cells

An efficient near-infrared (NIR) down-conversion in Ce3+-Yb3+ codoped oxyfluoride glass ceramics (GC) have been investigated with different annealing temperature. With an 430 nm (Ce3+: 4f -> 5d) excitation, the NIR emission at around 1000 nm (Yb3+: F-2(5/2) -> F-2(7/2)) was obtained which confirming efficient energy transfer between Ce3+ ions and Yb3+ ions. Subsequently, the possible mechanism of energy transfer was investigated and discussed. Finally, the energy conversion efficiency was measured which the Si solar cell covered by Ce3+-Yb3+ codoped oxyfluoride GC. The maximum efficiency which increased by 0.3% indicated that the Ce3+/Yb3+ sample had the potential applications for solar cells.